The department has now agreed, saying it was “in the public interest to make the decision without further delay”.

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The NoArc21 group, who are opposed to the incinerator at Glengormley are considering legal options

The facility plans to deal with black bin waste from six super councils.

It has been controversial from the start with residents of Glengormley opposing it because of concerns about traffic and the effect on property prices.

More than 3,500 objections were lodged when the planning application was first made.

A group set up to oppose plans for the plant, NoArc21, said it was disappointed at the decision.

‘Flawed proposal’

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The controversial project is planned for Hightown Quarry near Glengormley

Colin Buick, chair of the NoArc21 campaign, said news of the planning approval came out of the blue, but that his group was already planning a legal challenge.

“It would be our intention that we’ll be taking the legal route – a judicial review,” he said.

“We are also extremely concerned that the decision has been taken without a minister in place given the fact that all political parties have supported our campaign.

“The fact that 4,002 letters of objection and one petition of objection with 836 signatures were submitted in relation to the planning application shows the strength of feeling among the local community.

“Despite today’s announcement, local people will continue in our opposition to this flawed proposal and NoARC21 will be carefully considering our legal options,” he said.

The Department for Infrastructure took over planning responsibilities in the re-organisation of Stormont departments and its minister has the final say on major applications.

‘Anger, disappointment and confusion’

Speaking on BBC’s Good Morning Ulster on Thursday, former environment minister Mark H Durkan said he was “surprised at the timing of the decision”.

“There a lot of anger and disappointment, also a lot of confusion, as to how a decision of this magnitude can be made in the absence of a minister and executive.

“This should be more than a ministerial decision. In my opinion it should have been subject to an executive decision,” he said.

Despite planning officials recommending the application for approval, Mr Durkan said he rejected it because he felt it was “counter intuitive to the direction of travel I wanted to see as environmental minister, and that’s a road towards zero waste”.

However, the Planning Appeals Commission report said it took the view that that decision to refuse the application was “unjustified.”

It also said there was no evidence that the facility would not meet the regulatory requirements and there was “inadequate evidence that it would be a risk to human health”.

Mr Durkan said he stood by his original decision, adding: “I can sleep in my bed at night knowing I did the right thing”.

All five of Northern Ireland’s main parties have criticised the decision.

The Department of Infrastructure said it took the decision to approve the plan having “carefully considered and agreed” with the PAC report.

“It is clear from all the evidence presented in the planning application and debated at the PAC that there is a demonstrable need for this development,” it said.

“Northern Ireland needs new infrastructure in order to support a resource-efficient, self-sufficient, legitimate system of waste management.”